Most of these exist in the GLSL IR algebraic pass already. However,
SSA allows us to find more instances of the patterns.
total NIR instructions in shared programs: 2015593 -> 2011430 (-0.21%)
NIR instructions in affected programs: 124189 -> 120026 (-3.35%)
helped: 604
total i965 instructions in shared programs: 6025508 -> 6018718 (-0.11%)
i965 instructions in affected programs: 261070 -> 254280 (-2.60%)
helped: 1295
HURT: 2 (by 1 instruction each)
GAINED: 6
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/glsl/nir/nir_opt_algebraic.py | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/glsl/nir/nir_opt_algebraic.py
b/src/glsl/nir/nir_opt_algebraic.py
index dec250b..a5b5715 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -99,6 +99,16 @@ optimizations = [
(('ishr', a, 0), 0),
(('ushr', 0, a), 0),
(('ushr', a, 0), 0),
+ # Exponential/logarithmic identities
+ (('fexp2', ('flog2', a)), a), # 2^lg2(a) = a
+ (('fexp', ('flog', a)), a), # e^ln(a) = a
+ (('flog2', ('fexp2', a)), a), # lg2(2^a) = a
+ (('flog', ('fexp', a)), a), # ln(e^a) = a
+ (('fexp2', ('fmul', ('flog2', a), b)), ('fpow', a, b)), # 2^(lg2(a)*b) = a^b
+ (('fexp', ('fmul', ('flog', a), b)), ('fpow', a, b)), # e^(ln(a)*b) = a^b
+ (('fpow', a, 1.0), a),
+ (('fpow', a, 2.0), ('fmul', a, a)),
+ (('fpow', 2.0, a), ('fexp2', a)),
# This one may not be exact
(('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),
--
2.2.2
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